External memory interfaces implemented in Intel® Stratix® 10, Intel Arria® 10 or Intel Cyclone® 10 devices which require more than one I/O bank must be placed in adjacent I/O banks. An adjacent I/O bank is defined as an I/O bank with the same column number and a letter which is either before or after the respective I/O bank letter in the A-Z system.
Refer to the Modular I/O banks section of the Device Handbook I/O chapter or the General Purpose I/O User Guide of the Series 10 Device Family you are using. There are tables of the device parts in different packages indicating which I/O banks are used and how many pins are bonded out.
All I/O banks shown in the same I/O column are adjacent, unless a '-' symbol is shown . A '-' symbol indicates that the bank is not bonded out for the package.
If an I/O bank has less than 48 pins, the letter relationship of the I/O banks is also used to determine if they are adjacent.
The following examples explain these special cases.
For Arria 10 GX480 in package F29 with these I/O banks :
I/O bank 2I is not bonded out, indicating 2A is not adjacent to 2J.
For Arria 10 GX480 in package F34 with these I/O banks :
In this case I/O bank 2I is partially bonded out. The 12 pins in I/O bank 2I are adjacent to 2J but not to 2A. 2A is not adjacent to 2I.